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CVE-2026-42146— CImg Library: Uncontrolled memory allocation via nb_colors field in _load_bmp

Quick assessment

Affected
GreycLab CImg
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CImg是GREYC开源的一个用于图像处理的小型开源 C++ 工具包。 CImg存在安全漏洞，该漏洞源于未验证BMP文件头中nb_colors字段，可能导致分配过大内存并造成内存不足崩溃。

CVSS 5.5 · Medium EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
GreycLab CImg < c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3 affected
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I. Basic Information for CVE-2026-42146

Vulnerability Information
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Vulnerability Title
CImg Library: Uncontrolled memory allocation via nb_colors field in _load_bmp
Source: CVE Program / CVE List V5
Vulnerability Description
CImg Library is a C++ library for image processing. Prior to commit c3aacf5, the nb_colors field read from the BMP file header is used directly to compute an allocation size without validating it against the remaining file size. A crafted BMP file with a large nb_colors value triggers an out-of-memory condition, crashing any application that uses CImg to load untrusted BMP files. This issue has been patched via commit c3aacf5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
CImg 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CImg是GREYC开源的一个用于图像处理的小型开源 C++ 工具包。 CImg存在安全漏洞，该漏洞源于未验证BMP文件头中nb_colors字段，可能导致分配过大内存并造成内存不足崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GreycLab CImg < c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3 -

II. Public POCs for CVE-2026-42146

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III. Intelligence Information for CVE-2026-42146

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Patches & Fixes for CVE-2026-42146 (2)

Vendor Advisories for CVE-2026-42146 (1)

Other References for CVE-2026-42146 (1)

IV. Related Vulnerabilities

Same product: CImg
Same vendor: GreycLab
Same weakness: CWE-789

V. Comments for CVE-2026-42146

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